Superheater for marine, fire, or smoke tube boilers.



' J. EGGERS.

SUPERHEATER FOR MARINE, FIRE 0R SMOKE TU BE BOILER? APPLICATION man AUG-5,111 6.

1 96,055 Patented Mar. 1, 1919.

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JULIUS EGGERS, 0F WILHELMSI-IbHE, NEAR CASSEL, GERMANY, ASSIGNOR TO SCHMIDTSCHE HEISSDAMPF GESELLSCHAFT M. B. H., 0F CASSEL-WILHELMS- HfiHE, GERMANY, A CORPORATION OF GERMANY.

Specification of Letters Patent.

Patented Mar. 4, 1919.

Application filed August 4 1916. Serial No. 113,090.

To all whom it may concern:

Be it known that I, JULIUS Ecenns, a citizen of the German Empire, residing at Wilhelmshohe, near Cassel, Germany, have invented a new and Improved superheater for Marine, Fire, or Smoke Tube Boilers, of which the following is a specification.

The pitch of the tubes of marine fire or smoke tube boilers is such that the parallel pitch lines of the one direction, for instance of the vertical rows of the tubes, are situated at right angles or nearly at right angles to the parallel pitch lines of the other direction, 2'. e. to the horizontal or nearly horizontal rows of said tubes. The distance between two of all these lines, at the pitch now generally employed, is about 110 mil1imeters, the inner diameter of the fire or smoke tubes being 76, the outer 83 millimeters.

The superheater tubes located in these fire or smoke tubes consist each of a plurality of Us arranged in series in such a manner that, first, all U-parts belonging to one continuous superheater tube are in the same plane, and second, one smoke or fire tube contains one U, or U-shaped superheater tube part respectively. A continuous supeheater tube or element consists thus of a plurality of such U-shaped parts, or superheater-tubes proper, and of the curved connections between'these latter.

These connections, in the forms of construction as hitherto employed, are comparatively short, in consequence of which the superheater element, as a whole, is very rigid. Now, if deposits of flue dusts, salts, and the like, within the smoke or fire tubes, or between their inner walls and the superheater U-tubes respectively, effect a firm connection between all these tubes, then each such fiat superheater element behaves practically like a solid plate; removing itfrom the respective smoke or fire tubes requires much power and time and the respective superheater tube is often times damaged.

The object of my present invention is to overcome these drawbacks, and I attain that object in general by increasing the elasticity of the before-mentioned curved connections, and in particular by letting these latter extend diagonally instead of in the plane of the U-tubes, these tubes, 2'. e. the U-shaped parts of a superheater element, being now distributed upon tWo of the rows of the smoke or fire tubes. Owing to this arrangement of the U-tubes and to the diagonal posl-tlon of their connections, the radius of the curvature of these latter is longer than in the former execution, and these curved connectlons are, consequently, correspondingly more elastic. Furthermore, the plate formed by the U-parts of a superheater element and the adhering flue dust and the like 1s not fiat but zig-zag-shaped, which permits of considerably easier loosening it in the smoke or fire tubes by shaking it in the proper directions, the result being that the superheater element may be removed from said tubes without a particularly great ex penditure of power and time, as well as without damage.

Another advantage of my invention resides in this that the connections between the U-tubes may be more easily bent, owing to the longer radius of the curvature.

The ends of the superheater elements that belong to two neighboring rows of the smoke or fire tubes extend either horizontally or nearly horizontally to a vertical header, or vertically to a horizontal header, as the case may be.

In order to make my invention more clear, I refer to the accompanying drawings, in which:

Figure 1 is a front-view of two rows of superheater elements, each row consisting of three superheater tubes, and each of these having four U-parts lying in four smoke or fire tubes of two rows of such ones;

Fig. 2 is a plan of the upper superheater tube row;

Fig. 3 is a front view of the lefthand half of a marine boiler with smoke or fire tubes of small diameter and with nearly horizontally disposed superheater tubes connected to a vertical header; and

Fig. 4 is a front view of the righthand half of a marine boiler with smoke or fire tubes of large diameter and with vertically disposed superheater tubes connected to a horizontal header.

Referring to said figures, a is a marine smoke or fire tube boiler, and b are the smoke or fire tubes themselves, the pitch lines of which extend at right angles or nearly at right angles to each other, as customary with boilers of this kind. a are the superheater elements, the ends of which are detachably aflixed to the headers f 9 (Fig. 2) by screws and bridges 6 (Fig. 1). h (Figs. 3 and 4) are the furnace flues of the boiler.

In the form of construction shown in Figs. 13, the smoke or fire tubes 6 form three groups, in the interstices of which are arranged two pairs of vertical headers, each pair consisting ofa wet-steam header f and a superheated steam header g. Each'superheater element consists, as already mentioned in the short description of the figures, of four U-t'ubes which are connected in series by bent tube-parts i. The four U-tubes lie in smoke or fire tubes not of one of the (nearly) horizontal tube rows, but of two neighboring rows, in zig-zag or staggered arrangement; the bent parts 2' lie thus diagonally, as distinctly shown in Fig. 1. Each smoke or fire tube in any one of the (nearly) horizontal smoke or fire tube rows contains a U-tube, but the U-tubes in neighboring smoke or fire tubes belong always to two superposed superheater elements, as best to be seen in the middle tube row in Fig. 1. Two superposed superheater elements cooperate always with three smoke or the tube rows, just in consequence of the stag gered arrangement of the U'tubes of the elements, as described and shown.

Each row contains U-tubes of three superheater elements, the ends of which are so bent as to lie in a plane located between the two rows, the smoke or fire tubes of which cooperate with all the U-tubes of those three sets. Owing to this position of the element ends,- they are prevented from covering (seen in the longitudinal direction of the smokeor fire tubes) any part of any element situated above and below those having the just mentioned ends. The same arrangement is true with respect to every other set of elements as appears from Figs. 1 and 3. Consequently, each set may be removed from the two smoke or fire tube rows concerned without being impeded by the set above or by that below it; each set is completely independent of the neighboring ones.

In the modified form 01": construction shown in Fig. 4:, the superheater tube sets extend not horizontally, but vertically, and each of these vertical sets contains not three,

but only two elements. In all other respects, the object, the means, and the efiects, are exactly the same as described with regard to the other figures.

Having now described my invention what I desire to secure by a patent of the United States is:

1. In a marine boiler having smoke tubes arranged in a plurality of horizontal rows the individual tubes of each row being vertically in line with corresponding tubes of adjacent rows, a plurality of superheater units each comprising a series of U shaped loops one loop to one smoke tube, the loops belonging t a given unit lying successively in smoketu es which are alternately in one or the other of two adjacent horizontal rows and in immediately succeeding vertical rows, the individual loops being joined in series by bent connecting sections which lie in diagonal planes and the'ends of each super heater unit lying in a common plane parallel to and between the aforesaid adjacent horizontal rows. 7

2. In a marine boiler having smoke tubes arranged in a plurality of horizontal rows the individual tubes of each row being vertically in line with corresponding tubes of adjacent rows, a plurality of superheater units each comprising a series of U shaped loops one loop to one smoke tube the loops belonging to a given unit lying successively in smoke tubes which are alternately in one or the other of two adjacent horizontal rows and in immediately succeeding vertical rows, the individual loops being joined in series by bent connecting sections which lie in diagonal planes andthe ends of each super heater unit lying in a common plane parallel to and between the aforesaid adjacent horia zontal' rows, the alternate smoke tubes of the aforesaid adjacent rows left vacant by the loops of the first mentioned unit being occupied by loops belonging to another similar superheater unit. 7

In testimony whereof I have hereunto set my hand.

JULIUS scenes.

Witnesses GUsTAv TAUBE, PETER THOMSEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

